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Cisco Broadband Information

Posted on 2014-04-14
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Last Modified: 2014-04-24
Hi we have a Cisco router that I am not to familiar with regards to commands etc.

However we are changing Broadband from adsl to fibre optic

can somebody help to guide me in changing the PPPOA settings etc. on the relevant ports
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Question by:pepps11976
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by:Craig Beck
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If you're going from ADSL to fibre you'll probably need to use PPPOE instead.

What router do you have and who is your ISP?
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by:pepps11976
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Yes you are right the router is Cisco 887VAW and I believe the ISP is BT
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by:Craig Beck
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Ok try this...

service dhcp
!
ip dhcp excluded-address 192.168.1.254
!
ip dhcp pool DHCP
 network 192.168.1.0 255.255.255.0
 default-router 192.168.1.254
 dns-server 194.72.6.57 194.74.65.68
!
ip multicast-routing
!
interface Ethernet0
 no ip address
!
interface Ethernet0.101
 encapsulation dot1Q 101
 pppoe-client dial-pool-number 1
!
interface ATM0
 no ip address
 shutdown
 no atm ilmi-keepalive
!
interface Vlan1
 ip address 192.168.1.254 255.255.255.0
 ip flow ingress
 ip pim query-interval 126
 ip pim sparse-dense-mode
 ip nat inside
 ip virtual-reassembly in
 ip route-cache policy
 ip tcp adjust-mss 1452
 no shutdown
!
interface Dialer0
 mtu 1492
 ip address negotiated
 ip pim query-interval 126
 ip pim sparse-dense-mode
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 ip tcp adjust-mss 1452
 ip igmp version 3
 dialer pool 1
 dialer idle-timeout 0
 dialer persistent
 ppp authentication chap callin
 ppp chap hostname bthomehub@btbroadband.com
 ppp chap password 0 bthomehub@btbroadband.com
!
ip forward-protocol nd
ip http server
no ip http secure-server
!
ip nat inside source list 100 interface Dialer0 overload
!
ip route 0.0.0.0 0.0.0.0 dhcp
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
dialer-list 1 protocol ip permit

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by:pepps11976
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Ok if the server is issuing DHCP do I just miss that bit out?

What about username and password? For the connection

Sorry for newbie questions
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Expert Comment

by:Craig Beck
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Yep if you already have a DHCP server just ignore that bit.  You'll need to update the following lines with your IP range though incase it's different to what you use...

interface Vlan1
 ip address 192.168.1.254 255.255.255.0
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 any

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Obviously the Vlan1 IP address should be whatever your DHCP server gives to the clients as their default-gateway.

The username and password is right in my example.  BT use a generic user/pass for all Infinity PPPoE connections.
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by:pepps11976
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ok I will keep you posted

so I f I make the amendments and copy and paste all should be good?
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by:Craig Beck
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Should be.

I wrote that config for my 1841 router (also on Infinity).
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Author Comment

by:pepps11976
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ok just an update

so the old broadband was plugged directly into the VDSL port at the back of the router

so basically I just need to configure one of the LAN ports with the old ISP settings

LAN Port 0 is my internal LAN so I would like to use Lan Port 1 as my gateway.

I assume copying and pasting the above will still work

but what command would show me the old settings on the VDSL port as I cannot remember the username.

and also I do not need to configure the internal side on the router as that is already done so would the above still apply?
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Craig Beck earned 500 total points
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If the internal side is already done you just need this...

ip multicast-routing
!
interface Ethernet0
 no ip address
!
interface Ethernet0.101
 encapsulation dot1Q 101
 pppoe-client dial-pool-number 1
!
interface Dialer0
 mtu 1492
 ip address negotiated
 ip pim query-interval 126
 ip pim sparse-dense-mode
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 ip tcp adjust-mss 1452
 ip igmp version 3
 dialer pool 1
 dialer idle-timeout 0
 dialer persistent
 ppp authentication chap callin
 ppp chap hostname bthomehub@btbroadband.com
 ppp chap password 0 bthomehub@btbroadband.com
!

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The VDSL should plug straight into the DSL port on the router - it auto-detects based on the config you enter, so the Ethernet controller is VDSL and the ATM interface is ADSL.

The 4-port switch is for your LAN, so any of the 4 RJ45 ports will be your existing LAN.
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